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42
Q:

A watch which gains uniformly is 2 minutes low at noon on monday and is 4 min.48 sec fast at 2 p.m on the following monday. when was it correct ?

A) 2 p.m on Tuesday B) 2 p.m on Wednesday
C) 3 p.m on Thursday D) 1 p.m on Friday

Answer:   B) 2 p.m on Wednesday



Explanation:

Time from 12 p.m on monday to 2 p.m on the following monday = 7 days 2 hours = 170 hours

 

Therefore, The watch gains 2+445 min. or  34/5 min. in 170 hrs.

 

Now, 34/5 min. are gained in 170 hrs.

 

Therefore, 2 min are gained in 170×534×2 hrs = 50 hrs

 

Therefore, Watch is correct 2 days 2 hrs. after 12 p.m on monday i.e it will be correct at  2 p.m on wednesday.

Subject: Clocks

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